Synthesis, Characterization, and Reactivity of Neutral Octahedral Alkyl-Cobalt(III) Complexes Bearing a Dianionic Pentadentate Ligand
作者:Lucie Nurdin、Warren E. Piers、Jian-Bin Lin、Benjamin S. Gelfand
DOI:10.1021/acs.organomet.0c00223
日期:2020.6.22
was found in their reactions with the hydrogen atom donor 1,4-cyclohexadiene and the radical-trap TEMPO, as well as the observed cyclization of the 5-hexenyl group to the methylcyclopentyl derivative over the course of several hours. Despite these observations, it can be concluded that the diborate B2Pz4Py ligand provides a very stable platform for these Co(III) alkyls. Reduction by one electron to
报道了多种带有双阴离子四足五齿配体B 2 Pz 4 Py的中性烷基-钴(III)配合物。化合物2-R(R = CH 3,CH 2森达3,CH 2森达2 PH,我卜,CH 2(C ^ -C 5 ħ 9),和(CH 2)4 CH = CH 2)的合成产率为58-90%。这些抗磁性的八面体络合物在高达110°C的温度下具有热稳定性,并且对周围大气也非常稳定。通过光谱技术对它们进行了全面表征,在三种情况下,通过X射线晶体学对其进行了全面表征。Co-C键与氢原子供体1,4-环己二烯和自由基俘获体TEMPO的反应中发现了Co-C键可逆均裂的证据,以及观察到的5-己烯基环化成甲基环戊基衍生物的过程。几个小时的过程。尽管有这些观察结果,但可以得出结论,二硼酸盐B 2 Pz 4Py配体为这些Co(III)烷基提供了非常稳定的平台。一个电子还原为Co(II)烷基可以加速键的均裂,但是在这种情况下,使用钴茂作为